ICD-10 / XVI Certain conditions originating in the perinatal period / P80-P83 Conditions involving the integument and temperature regulation of fetus and newborn / P81 Other disturbances of temperature regulation of newborn / P81.8 Other specified disturbances of temperature regulation of newborn From parent levels Chapter XVI Certain conditions originating in the perinatal period Open Inclusions conditions that have their origin in the perinatal period even though death or morbidity occurs later Exclusions congenital malformations, deformations and chromosomal abnormalities (Q00 -Q99 ) endocrine, nutritional and metabolic diseases (E00 -E90 ) injury, poisoning and certain other consequences of external causes (S00 -T98 ) neoplasms (C00 -D48 ) tetanus neonatorum (A33 ) whooping cough (A37 .-) Block P80-P83 Conditions involving the integument and temperature regulation of fetus and newborn Open Category P81 Other disturbances of temperature regulation of newborn Open